Answer:
A shark's skeleton is made of cartilage , a type of strong but flexible tissue .Most other fish are covered in smooth , flat scales . A shark is covered in sharp , toothlike scales called denticles . Most other fish have flaps over their gills.
Explanation:
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Answer:
a long time just kidding
Explanation:
20,000 and 40,000 years ago this can be proved by fossil evidence.
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Answer:
nutrient absorption rate would drop drastically
Explanation:
The person would suffer severe malnutrition if not treated
Nitrogen is from the atmosphere is converted into nitrates by nitrogen fixing bacteria such as rhizobium which is found in the root nodules of leguminous crops
Answer:
used in an experiment as a way to ensure that your experiment actually work
Explanation:
